2005 LLY duramax trans tuning

[dwaller97]

hey guys im looking for some suggestions on what i should change in the trans for a quicker shift and maybe a touch firmer. i know i have to change shift times and pressures but i don't know how much i can change them and still be safe. this is a sock transmission. any help is appreciated!

[RandomEnthusiast]

I'd up the shift pressure by 2 or 3 psi till it feels good to you. Shift time reduce by .010 till it feels good. You don't want gear slamming. Just firm crisp shift.

[juicedimpss]

be careful. Allisons are much different than the 4l60/80 stuff. you can create problems trying to get them to shift "firm"

[dwaller97]

thanks guys ill be trying this in the next couple of days. i tried a tune from the tune repository but it shifted terrible so i returned it to stock. yes i learned quickly they are different than the 4l60/80s really quick. again thanks for the pointers. i will let ya'll know how it goes once the guy brings his truck back to me.

[nskyline34]

Any luck?

[dwaller97]

nothing yet. i havent had much time with the truck as the guy has been towing